Calculate Airflow Velocity in Test Section of Subsonic Wind Tunnel

 Method to Calculate the Airflow Velocity in the Test Section of a Sub-sonic Wind Tunnel

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How to Calculate the Airflow Velocity in the Test Section of the Subsonic Wind Tunnel

In order to calculate the airflow velocity in the test section of the wind tunnel we consider that one side of the mercury manometer is connected to the settling chamber (reservoir) and the other side is connected to the test section.

In order to calculate the airflow velocity, we require,

The Contraction Ratio of the Nozzle A2/A1 value

The Reservoir Pressure P1 in atm

The Reservoir Temperature T1 in Kelvin

When the tunnel is in operation, the difference in the heights of the mercury columns in cm.

The Density of Mercury. The default value of the Density of Mercury is taken to be 1.36e4 kg/m^3

Performing the calculation, we calculate the w(for mercury) value followed by the p1-p2 = wDelh value and finally, we get the Airflow Velocity denoted by V2 in the test section of the subsonic wind tunnel Units are m/sec.

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